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Eta-expand newtype coercions in External Core
[ghc-hetmet.git]
/
compiler
/
coreSyn
/
MkExternalCore.lhs
diff --git
a/compiler/coreSyn/MkExternalCore.lhs
b/compiler/coreSyn/MkExternalCore.lhs
index
337b21a
..
5ca4345
100644
(file)
--- a/
compiler/coreSyn/MkExternalCore.lhs
+++ b/
compiler/coreSyn/MkExternalCore.lhs
@@
-95,7
+95,11
@@
collect_tdefs tcon tdefs
-- See Note [Newtype coercions] in
-- types/TyCon
Just (arity,coKindFun) | (l,r) <- (coKindFun $ map mkTyVarTy vs) ->
-- See Note [Newtype coercions] in
-- types/TyCon
Just (arity,coKindFun) | (l,r) <- (coKindFun $ map mkTyVarTy vs) ->
- (vs,l,r) where vs = take arity tyvars
+ -- Here we eta-expand the newtype coercion,
+ -- which makes the ext-core typechecker somewhat simpler.
+ (tyvars,mkAppTys l extraVs,mkAppTys r extraVs)
+ where (vs, extraVs) = (take arity tyvars,
+ map mkTyVarTy $ drop arity tyvars)
Nothing -> pprPanic "MkExternalCore: coercion tcon lacks a kind fun"
(ppr tcon)
Nothing -> pprPanic "MkExternalCore: coercion tcon lacks a kind fun"
(ppr tcon)